無水硫酸鈣/7778-18-9

白色結(jié)晶性粉末。無氣味。加熱至100℃失去部分結(jié)晶水而成為半含水鹽(CaS O4?1/2H2O)，稱煅石膏。室溫時重又成為二水鹽，如再加熱，則完全脫水成無水鹽；即使再加水也不恢復。難溶于水(0.26g/100ml，18℃)，溶液皇中性，有澀味。微溶于甘油。不溶于乙醇。 相對密度2.96。熔點1450℃。
質(zhì)量標準
  

≥99.99% metals basis：


外觀Appearance                                     白色粉末或塊狀物
純度Purity                                                 ≥99.99% Based On Trace Metals Analysis
鈣Ca                                                           28.5% - 30.3%  (complexometric titration) 
痕量金屬分析Trace Metal Analysis        ≤200ppm by ICP Atomic emission

品級Grade                                                             分析純   
                                                                                  (AR) 
鐵Iron(Fe)                                                             ≤0.002%  
含量Assay                                                             ≥97.0%  
氯化物chloride(Cl)                                               ≤0.01%  
干燥失量drying loss                                             ≤1.0%  
鹽酸不溶物not dissolved matter in HCL        ≤0.05%  
銨ammonium(NH4)                                            ≤0.03%  
堿金屬及鎂alkali metal and magnesium         ≤0.5%